1. G-typesPhenotypesExp.Exp.#Observed# R_L_Purple flowers, long pollen9215284 R_llPurple flowers, round pollen37121 rrL_Red flowers, long pollen37121 rrllRed flowers, round pollen12455 Bateson & Punnett and sweet peas: P 1 : RRLL x rrll Purple flowersRed flowers Long pollenRound pollen F 1 : RrLl Purple flowers Long pollen F 2 : Total of 381 offspring Chapter 5: Linkage and Gene Mapping

2. Linkage and Gene Mapping *Independent assortment- during gamete formation segregating pairs of unit factors assort independently of one another *Linkage – condition in which two or more genes tend to be inherited together

3. An example of linkage: Purple, long42 Purple, round6 Red, long4 Red, round48 Progeny: 100 TOTAL NP R L r l X RrLlrrll Crossover results in gametes containing non-parental (NP) genotypes: *Complete linkage *Linkage ratio

4. Chromosome Mapping Frequency of recombinants (RF) measures the genetic distance between loci LR 11 m.u. Theoretical limit to distance between genes is 50m.u. Even if CO occurs 100% of the time, recombination is only observed in ½ of the gametes (or 50%)